Knock-out bottom



Sept. 23, 1930. w, SALISBURY 1,776,666

KNOCK OUT BOTTOM Filed Match 14, 1929 1 N VEN TOR. M75 17 J'yhlsgg Patented Sept. 23, 1,930 r i g w mmisims vmgbi rorinnoiflonrorfi V My invention relates. to a new and useful improvement in a'k nockout bottomused particularly in the pottery industry for serving as a bottom of the mold in which potsand similarreceptaclesare formed and also used inremoving the formedreceptacl'es from the female die after the spinner has performed its function and been raised from operating position. a

The present invention is an improvementof my invention on a k 'nockout bottom for which I'have filed application'for United States Letters Patent loy-"jmy application a Serial Number 302,742 filed August 29, 1928. It is an object ofthe present invention to provide in a knockout bottom having a rotatable member, resilient means for supporting the rotatable member in operative posi-v tion so arranged and constructedas to present a minimum obstruction so that clay and other material passing through the female die, may be free to drop so as not to interfere with the moving parts.

It is another object of the invention to prevent a clogging of clay or'other material from which the receptacles are made in a position so as to interfere with the free rotation or axial movement of the bottom.

Other objects will appear hereinafter.

:50; The invention consists in the combination and arrangement of parts hereinafter described and claimed. a

The invention will be best understood by a reference to the accompanying drawings which form a part of this specification, and

in which, r

Fig. 1 is a side elevational view of the invention showing it applied.

. Fig. 2 is a central vertical sectional view of the invention. i Fig. 3 is a view taken on line 3-3 of Fig. 2 with parts broken away. i In the drawings, I have illustrated a table 7 on which is supported the female die 8 in which a spinner (not shown) is adapted to engage for spinning and forming the plastic material to conform to the shape of the female die 8 and of the proper thickness. After the spinning operation, it is desired that the 51 formed article in the female die 8 may be removed therefrom; Engaging theinwardly' Q projecting flange 9 of the die 8 are-lugs 10 which project outwardly from the retainer 11 which is threaded onto the knob 12, in

which'isthreadedtheactuatingrod 13. The L 5571 1 bottom 14 is provided withthe centrally eX- tending shaft 15, which isfixedly" mounted thereto and which extends through thebushing 16, positioned in the retaining member 11; A bolt 1'1 is thre'aded iIit'o theloweriend of the shaft 15 andgengages awasherf18f which engages the end of the bushing 16. plurality of' slidable'pins 19 are, projected through the bottom 14, each :of these being provided with a head 20 which engages the-disc 21; having the boss 22 'which'engage s i in'a peripheral groove 22' formed axially in thebushing 16. -Secured to the end of the retainer 11 and projecting upwardlyithere= from"-in spaced relation, are leaf springs 23 which engage the 'undersurface of the disc 21 and-serve to retain the pins 19 thrustoutwardly" beyondthe outer surface of the bot-; tom 14.- Thefbottom 14, together with the" shaft 15, is rotatable "relatively to the retainer 11, thus carrying the pins 19 rotatably, so that a'pot placed in the die 8 and through the bottom of which the pins 19 may pro ject, will, if andwhen rotated by the spinner, carry with it the rotatable bottom 14, so that the; perforations formed in; the bottom of 7 the pot willbe the sizeof the pins19 and no:

deformation effected. The springs 23 give. thenecessaryiyieldability to the bottom 14, and it will be noted that thebottom of the screw 17 isspacedfrom the end of the member '13 sothat the shaft 15 may be; if're quired, moved. axially relatively to the retainer against the tension 'of mthe springs 23. i ff Withf'a knockout bottom formed in this manner2the-formation of articles, or -containers, such as p'ots and thelike, with a" V plurality ofopenings in thebase", maybe fabricated on :the automatic machines n'ow customarily used andan economical construction ofsuch articles effected. v y, 1 ziBy mounting the springs 23 onvth'eilugslOf instead of: forming these lugs as aperipheral flange, a 1 minimum obstruction is presented so that clay and other material sliding downwardly of the bottom 14, will be permitted to pass downwardly along the .retainer 11,

pass through to be discharged from the mold. There is of necessity, sufiicient space between the rotary bottom 14 and the female die side wall to permit free rotation of the bottom. While in practicefthis may be but a few thousandths of an inch, it. islarge enough to permit a small amount of the plastic to be forced therethrough by the pressure of the spinner in formingthearticle. To prevent any accumulation on. the flange 9 below the memberl i' and inv the region of the springs 2-1,. the clearway regions between the lugs 10 are provided. The retainer proper is also 'spa ced'from this flange '9 so that the clay whichleaks through the space between the rotaryjmember 1.4L andthe die: side wall may continue downwardly between the lugs 10 and. clear the die through the space between the edge ofthe flange 9 and the retainer 11. The retainer, in its-lowermost position, is supported bythevv flange 9 by means of the lugs 10 rest-ing thereon. The spring, ring and in mechanism is thereby maintained free rom any plastic accumulations.

While I have illustrated and described the preferred form of my invention, I do not wish to limit myself. to the precisedetails of structure shown, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention, what I claim. as new and. desire to secure by Letters Patentis: M

1. In a knockout bottom of. theclass described, a retaining member, a rotatable base,

pins slidably projected through said base, a.' plate for engaging the. lower ends of said,

pins, lugs mounted on said retaining member and projecting outwardly from the periphery support, aretainer-carri'ed by said support,

and arotatable die member mounted on said retainer, there'being a clearway provided be-.

M tween said support andretainer. I

a 3. In a. potterymo'ld, a. die providing a.

support, a retainer provided with overhang cooperating with said support to mount 1 said retainer thereon, said overhang providing a clearway between. said. support and rethereof, a support engaged by said lugs to;

, tainer and a bottom forming die carried by said retainer.

4. A plant pot mold comprising a side wall forming die, a bottom forming die relatively rotatable thereto, a retainer mounting said die supported by said side Wall die and having a clearway region therefrom.

' 5. In a pottery'forming die, a rotatable member, a retainer for said member, means for mounting said retainer leaving a clearway'between said retainer and mounting means.

6. In a pottery forming die, a rotatable bottom forming member, mounting means for said rotatable member comprising radially extending spaced lugs, and a support engaging the termini of said lugs to provide a clearway between said. mounting means and support. i

7. In. a pottery forming die, a rotatable bottom forming member having a depending shank, a bearing for said shank provided with a series of radially extending lugs, and mounting means for said lugs whereby a clearway region is provided between said mounting and bearing. 7 t

In testimony whereof I have signed the foregoing specification.

WILLIAM SALISBURY. 

